There is a new watch in town just in case you have a few millions to burn. It is called "Day and Night" and although it doesn't show the hour or the minute, it does tell if it is day or night by measuring the gravitational changes.

Oh yes, it also costs 300K dollars. According to the PR person, rich people don't use their watches for measuring time anyway.

Now I wasn't aware that the Earth's gravitational field is changing during the day. So how does this watch work exactly?

http://www.blogsmithmedia.com/www.luxist.com/media/2008/04/dayandnight-copy.jpg

Presumably because during the day you're on the side of the Earth nearer the sun, so there'll be a pull in both directions (up and down), and at night the pull will be down only.
I'm dubious that something that would fit into a watch is that sensitive though.

Well, I thought something similar but with the Moon. I would think the Moon's gravitational effect is stronger than the Sun's.

Duh!
I forgot about the moon!:wallbang:

But the moon does not only come out at night?:bugeye:

Maybe the watch needs adjusting every now and again :)

I can't think of any way it can work with gravitational changes. All I can think is that it detects the imparted momentum of the photons, or easier still, has a photovoltaic type detector. I'm stumped othewise..

It probably uses an Etvos balance to detect tidal changes - the bulges in the oceans and the planet itself. How's that for a guess?

or its a scam and its just got an internal watch

The watch doesn't use or detect gravity in any way. It simply has two movements that work in sequence. One movement will work for 12 hours, after which it will stop as the second movement starts. I think the confusion over 'gravity watch' comes from a misunderstanding of what a Tourbillion movement is. A Tourbillion movement is simply a complicated mechanical movement invented around 1800 to greatly lesson the effects on accuracy of the watch caused by placing the watch at different orientations. The watch will keep time as accurately in the vertical position as it does in the horizontal position. Gravity had an effect on the balance wheels of simplier designs, as well as the pendulums in clocks (:D), causing inaccuracy in timekeeping. The Tourbillion was the first watch design said to be 'unaffected by gravity'. Here is a link to the watch's manufacturer:
http://www.romainjerome.com/en/mouvements/rj-one-double-tourbillon-en.aspx

I love watches with completely extraneous functions -especially if they are big and chunky :) - like the Breitling that has the little cylinder that when you open it broadcasts an emergency signal.

http://en.wikipedia.org/wiki/Breitling#The_Breitling_Emergency

I'd love one but could never justify the expense :bawl:

My current watch has a mixed gas decompression computer for scuba diving - an electronic compass, and a wireless transmitter/receiver that I can use instead of a pressure gague - and its very chunky :D

http://www.divemagazine.co.uk/news/article.asp?UAN=4113&v=1

So looks like the gravity watch was a missnomer. It iis also possible that the ring around the watch is from the Titanic and that makes it so expensive...The maker has similar watches made from pieces of the Titanic....

Still wonder, does it need to be winded???

The company likes to make usesless watches: About the T-Oxy concept:

"Don’t wear it! The T-oxy Concept can only be admired under its glass dome filled with argon. Release it and oxygen will carry on its destructive work where it left off."

I love watches with completely extraneous functions -especially if they are big and chunky :) - like the Breitling that has the little cylinder that when you open it broadcasts an emergency signal.

http://en.wikipedia.org/wiki/Breitling#The_Breitling_Emergency

I'd love one but could never justify the expense :bawl:

My current watch has a mixed gas decompression computer for scuba diving - an electronic compass, and a wireless transmitter/receiver that I can use instead of a pressure gague - and its very chunky :D

http://www.divemagazine.co.uk/news/article.asp?UAN=4113&v=1

I knew you were a man of taste, I too harbour a fetish for the Breitling Emergency, and own a Suunto! I have the Suunto Vector (http://www.facewest.co.uk/Suunto-Vector.html?gclid=CN2f296hzpMCFQ2rQwodH1V5hg), which comes in handy when I'm out walking, or Snowboarding. The baromoter/weather prediction feature can come in handy, saved me from a couple of white-outs before.

I knew you were a man of taste, I too harbour a fetish for the Breitling Emergency, and own a Suunto! I have the Suunto Vector (http://www.facewest.co.uk/Suunto-Vector.html?gclid=CN2f296hzpMCFQ2rQwodH1V5hg), which comes in handy when I'm out walking, or Snowboarding. The baromoter/weather prediction feature can come in handy, saved me from a couple of white-outs before.

If I had the money, Suunto could completely satisfy my watch-related gadget fetish.
I have the D9 (and the older version - the Stinger http://ecx.images-amazon.com/images/I/41TB4ZEGEEL._AA280_.jpg) for necessity as I dive a lot for both work and pleasure. But I still have a hankering for the military GPS watch ( http://www.suuntowatches.com/Suunto-X9Mi.pro ) and the watch that helps you perfect your gold swing ( http://www.suuntowatches.com/catalog/product.jsp?productId=4720 ) - even though I don't even play golf :)

If your going to have a gadget make sure it's in wristwatch form - that's my motto :D

But I still have a hankering for the military GPS watch

Ooh, yes, I was considering one of those (I have to admit to having a little bit of a watch habit, ... I have 12, nothing that expensive, the Suunto at £150 was probably the costliest) but I upgraded my phone/PDA to one with built in GPS and I use that for navigation. Well, no, I use it when I get lost, I try to stay old school and use a map and compass.

I do like the Tissot t-touch too, ... but if I replaced by Suunto it would actually be with the Casio Pro Trek, it being solar powered, and having far better water resistance than either Suunto or Tissot. (I only snorkel, but I don't trust the Suunto underwater, I have a Citizen diver for when I snorkel or surf.)

On watch gadgets, .. I'd love some of these;

http://www.iwantoneofthose.com/gadgets-gizmos/hot-watches/walkie-talkie-watches/index.html

but as I wear my Suunto for snowboarding, and take a walkie talkie, I'm not quite sure how I'd make use of them, ... but thery are cool!

Under what conditions would you need a watch to tell you if it's night or day?
Maybe you work in an underground bunker.
Maybe you're a drug addicted socialite and need to be reminded to leave the club and take a shower.
It just seems completely fucking useless to me. There's a giant glowing ball in the sky that will tell you the same thing for free (at least it's free right now).

Under what conditions would you need a watch to tell you if it's night or day?
Maybe you work in an underground bunker.
It just seems completely fucking useless to me. There's a giant glowing ball in the sky that will tell you the same thing for free (at least it's free right now).

Well, the Vostok 'Submariner' ;

http://ecx.images-amazon.com/images/I/41mHC%2B1FfLL._SL500_AA280_.jpg


Has a little red indicator (in the middle of the dial) that flips to white, to denote day/night, 'cos you know, subs don't have windows. But yes, largely that's an anachronism, because these days folks can have digital watches that display am/pm or use 24hr clock, but if you want an old school mechanical watch, there it is. At a very reasonable price, too, especially compared to the one in the OP!

Here is the cheaper version:

http://www.ashlandpics.com/CS122005/THMBS/262.gif

If you can see the time it is day, if not it is night.

Let's stay at physics, how does this watch work?:

http://www.geekologie.com/2007/09/26/abacus-watch.jpg

The 600 Abacus watch was designed by Roy Schafer and is made by the Erich Lacher Watch Factory in Germany. "The ball moves to and fro across the face of the watch with the flow of the wearer's arm movements, but as soon as the Abacus reaches a horizontal position, the ball moves as if by magic - or at least by magnetism - to the right point in time."

That's pretty cool! It might have mercury switch that connects an electro magnet that turns with the time under the external metal plate. If it is a cool watch, the moving ball might even be inducing a current that charges a battery, with the loops being integrated in the sides between the glass and the plate.:shrug:

If you can see the time it is day, if not it is night.

lol :p

That's pretty cool! It might have mercury switch that connects an electro magnet

I still have trouble reading it. For example what is the time in the posted picture?

I still have trouble reading it. For example what is the time in the posted picture?

11:15 ?

About 11:15
Edit: bloody Enmos, nothing better to do than jump in and post before me!

11:16

I'd say about 11h30, but then you'd need the watch in your first picture to see if it's day or night!:cool:

If it's dark it's night.

If it's dark it's night.

What if you live in Alaska?

About 11:15
Edit: bloody Enmos, nothing better to do than jump in and post before me!

Sorry dude :D

What if you live in Alaska?

Then it serves you right.

The watch doesn't use or detect gravity in any way. It simply has two movements that work in sequence. One movement will work for 12 hours, after which it will stop as the second movement starts. I think the confusion over 'gravity watch' comes from a misunderstanding of what a Tourbillion movement is. A Tourbillion movement is simply a complicated mechanical movement invented around 1800 to greatly lesson the effects on accuracy of the watch caused by placing the watch at different orientations. The watch will keep time as accurately in the vertical position as it does in the horizontal position. Gravity had an effect on the balance wheels of simplier designs, as well as the pendulums in clocks (:D), causing inaccuracy in timekeeping. The Tourbillion was the first watch design said to be 'unaffected by gravity'. Here is a link to the watch's manufacturer:
http://www.romainjerome.com/en/mouvements/rj-one-double-tourbillon-en.aspx

Wow, did you see their website? They have a watch made from a piece of the Titanic:

Don’t wear it! The T-oxy Concept can only be admired under its glass dome filled with argon. Release it and oxygen will carry on its destructive work where it left off.

Wow, did you see their website? They have a watch made from a piece of the Titanic:

Don’t wear it! The T-oxy Concept can only be admired under its glass dome filled with argon. Release it and oxygen will carry on its destructive work where it left off.

I didn't go to their website, but I did read this thread...

So looks like the gravity watch was a missnomer. It iis also possible that the ring around the watch is from the Titanic and that makes it so expensive...The maker has similar watches made from pieces of the Titanic....

Still wonder, does it need to be winded???

The company likes to make usesless watches: About the T-Oxy concept:

"Don’t wear it! The T-oxy Concept can only be admired under its glass dome filled with argon. Release it and oxygen will carry on its destructive work where it left off."

:p

Doh!

Well, I meant my 3rd posted watch with the 1 dot on it. How can you tell the time if there is only 1 dot? or I guess you have to guess between somewhere 11 and 12?

The other version was that it also moves from the center to the side, thus closer it is to the side, it is closer to the full hour. but that is still just app. time....

Overall opinion:

Ostentatious bullshit for rich people to spend their money on so they can jerk each other off at parties.

My wild guess was based on the premise (in the OP) the the device "measures" gravity. Tidal bulges and an Etvos were what popped up, but thinking about it, how the hell would a balance stay oriented - i.e. fixed - to measure a gravitational difference, if it's on someone's wrist?

Therefore the OP must be wrong - what's happening is gravitational interaction with a movement that works in a vertical or horizontal orientation - an escapement "driven" by gravity. Presumably this watch is self-winding?

Apart from the obvious fact that lunar tides don't have a 24-hour cycle.
'Doh!'

Most probable explanation was already given in post #10, had you bothered to read the thread...

actually for that sort of price...it might as well be a gyroscope...an extremely good one

Most probable explanation was already given in post #10, had you bothered to read the thread...Yes, but I left my time-travel watch somewhere, so unfortunately I was unable to travel forward in time to read post #10, before posting post #8.

Sometimes life just works out like that.